Request: modify patches() to output clumps of cells wth the same value

[aloboa]

It would be helpful if the output of patches() were clumps of cells with the same value, regardless
the neighbors are NA or not.

input:
55555555555
55555555555
55444554455
55444554445
54444454455
55555555555
output
11111111111
11111111111
11222113311
11222113331
12222213311
11111111111

(see end of #576)

The desired output can be (inefficiently) obtained by running the current patches() within a loop for all unique(values(input)).

[Nowosad]

Same as #495?

[aloboa]

Same as #495?

Yes, and it is very similar to #576 too. I opened a new one to make a more appropriate title and specify it as a Feature request, not a bug.